Angioplasty is a medical procedure in which an obstructed blood vessel is widene

Question

Angioplasty is a medical procedure in which an obstructed blood vessel is widened. In some cases, a wire mesh tube, called a stent, is placed in the vessel to help it remain open. An article presents the results of a study comparing the effectiveness of a bare metal stent with one that has been coated with a drug designed to prevent re-blocking of the vessel. A total of 5321 patients received bare metal stents, and of these, 841 needed treatment for re-blocking within a year. A total of 1120 received drug coated stents and 134 of them required treatment within a year.

Explanation / Answer

Solution:-

The confidence interval would be more precise if 1000 additional patients are treated with bare metals stents.

As the sample size increases the standard error decreases, hence margin of error also decreases which results in more precision.

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